Upcoming fuel economy regulations in the U.S. and carbon dioxide emissions limits in Europe appear set to take a bite out of the next generation Saab 9-3. The current 9-3 is derived from GM's Epsilon platform and the new 9-3 was due to come off the Epsilon II that underpins the new Opel Insignia, but a change may be in the works. GM has reportedly canceled the Epsilon II-based 9-3 in favor of a model built off the Global Compact Car platform that will be the basis of the next Astra/Cobalt and, of course, the Volt. If the new plan, proceeds that would give Saab two cars off the new chassis with the smaller 9-1 being the other. New structural construction technology in the new architecture will apparently help maximize interior space in the smaller car.